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Vent
A volcano or volcanic vent is an opening in the earth's surface that allows melted rock (lava) to flow out.
Opening a file...for writing!
A recharge pit refers to a shaft that allows the rainwater to replenish groundwater. It can also be built to recharge a bore well.
Pupil.
That's called a vent.
The opening in the eye which allows light to pass through is called the pupil.
If you don't have proper drainage it will drown the plant and also cause mold and such and rot the roots.
The stoma (stomata)
Vents
Where urine comes out of.
By aerating and breaking up the soil it allows rainwater to penetrate easier and loosens the soil so that roots can take better hold.